Mr. E. A. Smith on Arctic Mollusca. 133 



is very different from the type shell as delineated in Reeve's 

 figure ; here the aperture, together with the basal canal, has 

 a length of exactly half the shell, whilst in one of the speci- 

 mens before me it occupies more than three fifths of the entire 

 length. The second specimen is intermediate with regard to 

 this character ; and this induces one to conclude that the diffe- 

 rences in length of the mouth and canal and the proportion 

 of them to the height of the spire are not at all reliable cha- 

 racters in this group of the genus. In other respects there 

 seems to be no difference, the sculpture and epidermis being 

 of precisely the same character. 



In Dr. Gray's collection there is a tablet containing some 

 specimens of this species labelled Sahi'nn; but none of them 

 can be his type, for all are larger than the dimensions given ; 

 and it must ever remain uncertain whether his species is un- 

 doubtedly the same as F. tortuosus. Dr. Gwyn Jeffreys con- 

 siders that the same species is described by Gray and Reeve, 

 and among the synonyma gives F. spitzbergensis^ Reeve, F. 

 ehur, F. togatusj and F. Pfaifi, described by Morch. The first 

 of these is, in all probability, merely a strongly sculptured 

 form of this species 5 and tlie others are only known to me from 

 description. 



Buccinum hydrophanum, Hancock. 



Ann. & Mag. Nat. Hist. 1846, xviii. p. 325, pi. o. fig. 7 ; Reeve, Couch. 



Icon. vol. iii. f. 103. 

 Tritonium (/ranlandmmi, Chemn., var. a, Morch, Mollusc. Gronlandise, 



1857, nos. 94-5. 

 Tritonium hydrophaniwi, Hancock, Morch, Arctic Manual, 1875, p. 128, 



no. 106. 



Hab. Franklin- Pierce Bay [FeUden and Hart) ; Dobbin 

 Bay, 30 fras. {Hart). 



This species varies considerably with regard to the length 

 of the spire, as may be seen by comparing the figures by 

 Hancock and Reeve. The convexity of the whorls is likewise 

 subject to much variation, the examples from the above locali- 

 ties having them remarkably rotund, more so than Hancock's 

 figure represents tliem. This author describes the epidermis, 

 " pale yellow ;" and Reeve gives it, " pale green ;" and some 

 young specimens from Dobbin Bay, the only ones possessing 

 the epidermis, have it of a brownish olive colour. 



This species has also been obtained from the west coast of 

 Davis Straits and at Olrik, 200-300 fms. {Morch). 



Buccinum Belcher i, var.. 

 Reeve, Belcher's Last Arctic Voyage, vol. ii. p. 394, pi. 32. f. 7 a, b. 

 Shell ovately conical, very thin, purplish brown, with a few 



